| Mathbox for metakunt |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > Mathboxes > recbothd | Structured version Visualization version GIF version | ||
| Description: Take reciprocal on both sides. (Contributed by metakunt, 12-May-2024.) |
| Ref | Expression |
|---|---|
| recbothd.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
| recbothd.2 | ⊢ (𝜑 → 𝐴 ≠ 0) |
| recbothd.3 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| recbothd.4 | ⊢ (𝜑 → 𝐵 ≠ 0) |
| recbothd.5 | ⊢ (𝜑 → 𝐶 ∈ ℂ) |
| recbothd.6 | ⊢ (𝜑 → 𝐶 ≠ 0) |
| recbothd.7 | ⊢ (𝜑 → 𝐷 ∈ ℂ) |
| recbothd.8 | ⊢ (𝜑 → 𝐷 ≠ 0) |
| Ref | Expression |
|---|---|
| recbothd | ⊢ (𝜑 → ((𝐴 / 𝐵) = (𝐶 / 𝐷) ↔ (𝐵 / 𝐴) = (𝐷 / 𝐶))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | recbothd.1 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
| 2 | recbothd.3 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
| 3 | recbothd.4 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ≠ 0) | |
| 4 | 1, 2, 3 | divcld 11931 | . . . . . 6 ⊢ (𝜑 → (𝐴 / 𝐵) ∈ ℂ) |
| 5 | recbothd.2 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ≠ 0) | |
| 6 | 1, 2, 5, 3 | divne0d 11947 | . . . . . 6 ⊢ (𝜑 → (𝐴 / 𝐵) ≠ 0) |
| 7 | 4, 6 | jca 511 | . . . . 5 ⊢ (𝜑 → ((𝐴 / 𝐵) ∈ ℂ ∧ (𝐴 / 𝐵) ≠ 0)) |
| 8 | recbothd.5 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ ℂ) | |
| 9 | recbothd.7 | . . . . . . 7 ⊢ (𝜑 → 𝐷 ∈ ℂ) | |
| 10 | recbothd.8 | . . . . . . 7 ⊢ (𝜑 → 𝐷 ≠ 0) | |
| 11 | 8, 9, 10 | divcld 11931 | . . . . . 6 ⊢ (𝜑 → (𝐶 / 𝐷) ∈ ℂ) |
| 12 | recbothd.6 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ≠ 0) | |
| 13 | 8, 9, 12, 10 | divne0d 11947 | . . . . . 6 ⊢ (𝜑 → (𝐶 / 𝐷) ≠ 0) |
| 14 | 11, 13 | jca 511 | . . . . 5 ⊢ (𝜑 → ((𝐶 / 𝐷) ∈ ℂ ∧ (𝐶 / 𝐷) ≠ 0)) |
| 15 | 7, 14 | jca 511 | . . . 4 ⊢ (𝜑 → (((𝐴 / 𝐵) ∈ ℂ ∧ (𝐴 / 𝐵) ≠ 0) ∧ ((𝐶 / 𝐷) ∈ ℂ ∧ (𝐶 / 𝐷) ≠ 0))) |
| 16 | rec11 11853 | . . . 4 ⊢ ((((𝐴 / 𝐵) ∈ ℂ ∧ (𝐴 / 𝐵) ≠ 0) ∧ ((𝐶 / 𝐷) ∈ ℂ ∧ (𝐶 / 𝐷) ≠ 0)) → ((1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)) ↔ (𝐴 / 𝐵) = (𝐶 / 𝐷))) | |
| 17 | 15, 16 | syl 17 | . . 3 ⊢ (𝜑 → ((1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)) ↔ (𝐴 / 𝐵) = (𝐶 / 𝐷))) |
| 18 | 17 | bicomd 223 | . 2 ⊢ (𝜑 → ((𝐴 / 𝐵) = (𝐶 / 𝐷) ↔ (1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)))) |
| 19 | 1, 2, 5, 3 | recdivd 11948 | . . 3 ⊢ (𝜑 → (1 / (𝐴 / 𝐵)) = (𝐵 / 𝐴)) |
| 20 | 8, 9, 12, 10 | recdivd 11948 | . . 3 ⊢ (𝜑 → (1 / (𝐶 / 𝐷)) = (𝐷 / 𝐶)) |
| 21 | 19, 20 | eqeq12d 2752 | . 2 ⊢ (𝜑 → ((1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)) ↔ (𝐵 / 𝐴) = (𝐷 / 𝐶))) |
| 22 | 18, 21 | bitrd 279 | 1 ⊢ (𝜑 → ((𝐴 / 𝐵) = (𝐶 / 𝐷) ↔ (𝐵 / 𝐴) = (𝐷 / 𝐶))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2932 (class class class)co 7367 ℂcc 11036 0cc0 11038 1c1 11039 / cdiv 11807 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-po 5539 df-so 5540 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-div 11808 |
| This theorem is referenced by: lcmineqlem11 42478 |
| Copyright terms: Public domain | W3C validator |